1. What is the Current Formula?

The current formula (I = P/V) is derived from Ohm's Law and calculates electrical current (amperage) when you know the power (in watts) and voltage (in volts). It's fundamental in electrical engineering and circuit design.

2. How Does the Calculator Work?

The calculator uses the current formula:

Where:

• \( I \) — Current in amperes (amps)
• \( P \) — Power in watts
• \( V \) — Voltage in volts

Explanation: The formula shows that current is directly proportional to power and inversely proportional to voltage.

3. Importance of Current Calculation

Details: Calculating current is essential for designing safe electrical circuits, selecting appropriate wire gauges, and ensuring devices operate within their rated capacities.

4. Using the Calculator

Tips: Enter power in watts and voltage in volts. Both values must be positive numbers. The calculator will compute the current in amperes.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between AC and DC current?
A: DC (Direct Current) flows in one direction, while AC (Alternating Current) periodically reverses direction. The formula works for both, but RMS values should be used for AC.

Q2: How does current relate to wire size?
A: Higher currents require thicker wires to prevent overheating. Each wire gauge has a maximum safe current rating.

Q3: What happens if voltage is zero?
A: The formula becomes undefined (division by zero). In reality, zero voltage means no current will flow.

Q4: Can this formula be used for three-phase systems?
A: For three-phase systems, the formula is \( I = P / (V \times \sqrt{3} \times PF) \) where PF is power factor.

Q5: How accurate is this calculation?
A: It's mathematically precise for ideal conditions. Real-world factors like resistance, temperature, and power factor may affect actual current.